Phonograph-reproducer



D. H. WILSON.

PHONOGRAPH REPRODUCER.

APPLICATION FILED JUNE b.1920.

1,390,962. Patented Sept, 13, 1921.

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PATENT OFFICE.

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Toall whom it may concern:

Be it known that I,.DAvn) H. WILSON, a citizen of the United States of America, residin at 6031 Trinitystreet, Philadelphia, and State of Pennsylvania, have invented certain new and useful Improvements in Phonograph-Reproducers, of which. the following is a specification.

This invention relates to phonographs, and has special reference to reproducers for such instruments.

Oneimportant object of the invention is to provide an improved general construction of phonograph reproducers.

A second important object of the invention is to provide an improved form of reproducer having an elastically mounted diaphragm.

A third important object of the invention is to provide an improved form of reproducer wherein the diaphragm sound box is supported only at spaced points in an outer shell or holder.

With the above and other objects'in view, as will be hereinafter apparent, the invention consists in general of certain novel arrangements of details and combinations of parts hereinafter fully described, illustrated in the accompanying drawings and speoifi cally claimed.

In the accompanying drawings like characters of reference indicate like parts in the several views, and

Figure 1 is a transverse section through a reproducer constructed in accordance with this invention.

Fig. 2 is a face view of part of such a reproducer showing the lever support.

Fig. 3 is a side view of the parts shown in Fig. 2.

Fig. 4 is a perspective view thereof.

Fig. 5 is a section of a portion of the reproducer showing the parts disassembled.

Fig. 6 is a detail view of certain supportin rings used herewith.

n the form of the invention herein illustrated, the same being typical of the various forms the invention ma assume, there is provided a plate 10 forming the back of the sound box and having its edges threaded. This plate is provided with a centrally disposed nipple 11 which projects rearwardly to fit over the neck 12 of a phonograph horn (the body of the latter not being shown). Screwed onto this plate is a ring 13 which is L-shaped in cross section and forms the side i Specification of Letters Patent. Patented Sept 13, 1921 I Application filed June 1,

1920. Serial No. 385,800.

to expose the diaphragm l4which. is pe-.,.

ripherally supported in the box bythe hol low elastic rings .15 which are preferably formed of rubber tubing; .These parts are so proportioned that, when assembled, the elastic rings are compressed. as clearly shown in Fig. .1. i

Surrounding this sound box is a casing or housing consisting of a back member 16 having a centrally disposed opening 17 wherethrough the nipple 11 passes freely so that the two do not contact. Projecting from the front face of this plate adjacent its periphery is an annular flange 18 threaded on its outer surface and fitting neatly around the ring 13 as shown. Screwed on the flange 18 is a ring 19 which is L-shaped in cross section so that the central part of the front of the housing is open.

In order to hold the casing or housing in position and yet have the same sufficiently terfere with proper tone production certain novel means are employed whereby the two parts are connected, or rather supported relative to each other, at spaced points. These means consist of a pair of annular plates 20 having on each side hardened steel conical proi'ections 21 which are preferably opposite y disposed. The apices of these pro ections bear respectively on the outside of the sound box and the inner face of the casing which is thus supported from the sound box at space intervals, the supports having acute point contact with the box and easing.

Considering now the needle lever and its arrangement. Projecting from the casing member 19 are spaced posts 22 which are connected at their outer ends by a bridge piece 23 having a centrally disposed threaded aperture 24. Through this aperture passes a thumb screw 25 having a reduced end which engages in an o ening in a bowed leaf spring 26 one end 0 which is fixed to a needle lever 27 while the other end slides freely thereon. On the under side of the lever is secured a cantaliver leaf spring 28 the free end of which lies beneath the spring 26 and rests on the casing member 19.

Secured to the inner end of the lever, which overlies the center of the diaphragm 14, is a screw 29 which passes through the diaphragm 14 and has nuts 30 on each side of lOO said diaphragm to connect the lever and diaphragm in adjusted relation.

Thus by means of the thumb screw 25 the tension of the spring fulcrum may be varied at will and theaction of the needle lever on the"diaphragmproperlyadjusted as desired.

the purpose specified.

Having thusidescribed theinv ention, what is claimed as new, is

1L In aphonograph reproducer, a sound box, aicasingsurrounding the soundhex, and" -a series of oppositely pointed conesha-ving.

their bases fixed substantially in the same plane and their apices engaging the outside of the sound box and the inside of the casing respectively.

2. In a phonograph reproducer, a sound box, a casing surrounding the sound box, the front and back of the casing being spaced respectively from the front and back of the sound box, an annular plate on each side of the sound box, and conical projections extending from the annular plates and engaging respectively with the casing and sound box.

In testimony whereof I have affixed my signature.

DAVID H. WILSON. 

